/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #f0f0f0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #007bff;
}

/* 头部横幅 */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-top: 70px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: #007bff;
    color: white;
    border-color: #007bff;
}

.btn-primary:hover {
    background: #0056b3;
    border-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 123, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: #333;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: #007bff;
    border-color: #007bff;
}

.btn-outline:hover {
    background: #007bff;
    color: white;
    transform: translateY(-2px);
}

/* 文章区域 */
.articles-section {
    padding: 100px 0;
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #333;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.article-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.article-category {
    background: #e3f2fd;
    color: #1976d2;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.article-date {
    color: #666;
    font-size: 0.9rem;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
    color: #333;
}

.article-excerpt {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.article-footer {
    border-top: 1px solid #f0f0f0;
    padding-top: 1rem;
}

.article-author {
    color: #888;
    font-size: 0.9rem;
}

.section-footer {
    text-align: center;
}

/* 联系区域 */
.contact-section {
    padding: 100px 0;
    background: white;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.contact-info > p {
    color: #666;
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
}

.contact-methods {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #e9ecef;
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-label {
    font-weight: 500;
    color: #333;
}

.contact-value {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
}

.contact-value:hover {
    color: #0056b3;
}

.response-time {
    color: #888;
    font-size: 0.9rem;
    font-style: italic;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    padding: 30px 0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .nav-menu {
        gap: 20px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .articles-section,
    .contact-section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .article-card {
        padding: 20px;
    }
    
    .contact-methods {
        padding: 20px;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}